/*******************************************************************************
 * Copyright 2014 United States Government as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package gov.nasa.ensemble.emf.util;

import gov.nasa.ensemble.common.operation.CompositeOperation;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;

/**
 * An abstract class that may have subclasses defined that contribute additional operations to a CompositeOperation created by UndoableObservableValue
 * to change the value of an EMF attribute in the Detail view. This is useful for updating additional bookkeeping attributes that might record who made
 * the change and when it was made. When the primary change is undone, the changes to these bookkeeping attributes will be undone as well.
 * 
 * @author rnado
 *
 */
public abstract class UpdateValueOperationContributor {

	public abstract void contributeOperations(CompositeOperation toDoList, EObject target, EStructuralFeature feature, Object oldValue, Object newValue);
	
}
